New books - Electrical probes for plasma diagnostics

Swift, J. D.; Schwar, M. J. R.

doi:10.1021/ac50160a018

Cited by 90 publications

(83 citation statements)

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“…Recombination rate coefficients are derived from the electron density decay monitored along section C by the axially movable cylindrical Langmuir probe [17,25]. While gas flow velocity (v) (i.e.…”

Section: Methodsmentioning

confidence: 99%

Cryo-FALP study of collisional-radiative recombination of Ar⁺ions at 40–200 K

Dohnal

Rubovič

Plašil

et al. 2011

Eur. Phys. J. Appl. Phys.

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Abstract. New flowing afterglow apparatus, Cryo-FALP, was built to study ternary Collisional Radiative Recombination (CRR) of Ar + ions with electrons in He/Ar afterglow plasma at temperatures 40 -200 K. The obtained ternary recombination rate coefficient at 57 K is KCRR = (3±1)×10 −17 cm 6 s −1 . It is the first time that the KCRR was measured below 77 K. The measured temperature dependence KCRR ∼ T (−4.5±0.4) is in a good agreement with theoretical prediction.

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Section: Methodsmentioning

confidence: 99%

Cryo-FALP study of collisional-radiative recombination of Ar⁺ions at 40–200 K

Dohnal

Rubovič

Plašil

et al. 2011

Eur. Phys. J. Appl. Phys.

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“…Depending on plasma parameters and probe geometry, different theories exist to interpret the I -V characteristics and deduce plasma parameters. [1][2][3][4][5] Usually, the probe is swept at a frequency much lower than that of typical plasma fluctuations and the I -V curve is used to deduce time average quantities. Time-dependent measurements are often limited to ion-saturation current and floating potential measurements, i.e., to the current drawn from the plasma at a strong negative probe potential and the potential for which the probe draws no current, respectively.…”

Section: Introductionmentioning

confidence: 99%

Practical solutions for reliable triple probe measurements in magnetized plasmas

Theiler

Furno

Kuenlin

et al. 2011

Review of Scientific Instruments

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The triple probe method to obtain local, time-resolved measurements of density, electron temperature and plasma potential is investigated in detail. The difficulties in obtaining reliable measurements with this technique are discussed and overcome. These include phase delay errors, ion sheath expansion and limited bandwidth due to stray capacitance to ground. In particular, a relatively simple electronic circuit is described to strongly reduce stray capacitance. Measurements with the triple probe are presented in a plasma characterized by interchange-driven turbulence in the TORPEX device. The measured time-averaged and time-dependent, conditionally averaged parameters are cross-checked with other Langmuir probe based techniques, and show good agreement. Triple probe measurements show that electron temperature fluctuations are sufficiently large, such that the identification of plasma potential fluctuations with fluctuations of the floating potential is not a good approximation. Over a large radial region, the time-averaged fluctuation-induced particle flux can, however, be deduced from floating potential only. This is because the phase shift between density and electron temperature is close to zero there and temperature fluctuations do not give rise to a net radial particle transport.

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“…To obtain information on para/ortho H + 3 composition in the afterglow plasma, which is important for evaluation of state specific recombination rate coefficients we measured this composition in parallel SA-CRDS experiment at temperatures 77-300 K [5][6][7]12]. In the Cryo-FALP II setup the movable Langmuir probe [26] measures the electron number density along the flow tube and the time evolution of electron density in afterglow plasma (see example in Fig. 1) can be obtained [27][28][29].…”

Section: Methodsmentioning

confidence: 99%

State selective study of H₃⁺recombination in Cryo-FALP and SA-CRDS experiments at 77 K

Glosı́k

Hejduk

Dohnal

et al. 2015

EPJ Web of Conferences

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Abstract. Rate coefficients for nuclear spin state-specific recombination of H + 3 ions with thermal electrons were measured using FALP and SA techniques at temperatures 77-300 K. For this purpose H 2 gas with both thermal and enriched population of the para nuclear spin configuration was used. Measurements have shown that at 77 K para-H + 3 exhibits five times higher binary recombination rate coefficient than ortho-H + 3 : (1.5 ± 0.4) × 10 −7 vs. (3 ± 2) × 10 −8 cm 3 s −1 .

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New books - Electrical probes for plasma diagnostics

Cited by 90 publications

References 0 publications

Cryo-FALP study of collisional-radiative recombination of Ar⁺ions at 40–200 K

Cryo-FALP study of collisional-radiative recombination of Ar⁺ions at 40–200 K

Practical solutions for reliable triple probe measurements in magnetized plasmas

State selective study of H₃⁺recombination in Cryo-FALP and SA-CRDS experiments at 77 K

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New books - Electrical probes for plasma diagnostics

Cited by 90 publications

References 0 publications

Cryo-FALP study of collisional-radiative recombination of Ar+ions at 40–200 K

Cryo-FALP study of collisional-radiative recombination of Ar+ions at 40–200 K

Practical solutions for reliable triple probe measurements in magnetized plasmas

State selective study of H3+recombination in Cryo-FALP and SA-CRDS experiments at 77 K

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Cryo-FALP study of collisional-radiative recombination of Ar⁺ions at 40–200 K

Cryo-FALP study of collisional-radiative recombination of Ar⁺ions at 40–200 K

State selective study of H₃⁺recombination in Cryo-FALP and SA-CRDS experiments at 77 K